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Program: How to delete user defined objects from LinkedHashSet?


Description:

Below example shows how to delete user defined objects from LinkedHashSet. You can achieve this by implementing equals and hashcode methods at the user defined objects.


Code:
package com.java2novice.linkedhashset;

import java.util.LinkedHashSet;

public class MylhsDeleteObject {

	public static void main(String a[]){
		
		LinkedHashSet<Price> lhs = new LinkedHashSet<Price>();
		lhs.add(new Price("Banana", 20));
		lhs.add(new Price("Apple", 40));
		lhs.add(new Price("Orange", 30));
		for(Price pr:lhs){
			System.out.println(pr);
		}
		Price key = new Price("Banana", 20);
		System.out.println("deleting key from set...");
		lhs.remove(key);
		System.out.println("Elements after delete:");
		for(Price pr:lhs){
			System.out.println(pr);
		}
	}
}

class Price{
	
	private String item;
	private int price;
	
	public Price(String itm, int pr){
		this.item = itm;
		this.price = pr;
	}
	
	public int hashCode(){
		System.out.println("In hashcode");
		int hashcode = 0;
		hashcode = price*20;
		hashcode += item.hashCode();
		return hashcode;
	}
	
	public boolean equals(Object obj){
		System.out.println("In equals");
		if (obj instanceof Price) {
			Price pp = (Price) obj;
			return (pp.item.equals(this.item) && pp.price == this.price);
		} else {
			return false;
		}
	}
	
	public String getItem() {
		return item;
	}
	public void setItem(String item) {
		this.item = item;
	}
	public int getPrice() {
		return price;
	}
	public void setPrice(int price) {
		this.price = price;
	}
	
	public String toString(){
		return "item: "+item+"  price: "+price;
	}
}

Output:
In hashcode
In hashcode
In hashcode
item: Banana  price: 20
item: Apple  price: 40
item: Orange  price: 30
deleting key from set...
In hashcode
In equals
Elements after delete:
item: Apple  price: 40
item: Orange  price: 30
<< Previous Program 

List Of All LinkedHashSet Sample Programs:

  1. Basic LinkedHashSet Operations.
  2. How to delete all elements from LinkedHashSet?
  3. How to add another collection to LinkedHashSet?
  4. How to iterate through LinkedHashSet?
  5. How to compare two LinkedHashSet and retain elements which are same on both LinkedHashSet?
  6. How to copy content of LinkedHashSet to an array?
  7. How to delete specific element from LinkedHashSet?
  8. How to search an object from LinkedHashSet?
  9. How to eliminate duplicate user defined objects from LinkedHashSet?
  10. How to find user defined objects from LinkedHashSet?
  11. How to delete user defined objects from LinkedHashSet?
Knowledge Centre
Different types of Access Modifiers
public: Any thing declared as public can be accessed from anywhere.

private: Any thing declared as private can't be seen outside of its class.

protected: Any thing declared as protected can be accessed by classes in the same package and subclasses in the other packages.

default modifier: Can be accessed only to classes in the same package.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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